/*! iScroll v5.2.0-snapshot ~ (c) 2008-2017 Matteo Spinelli ~ http://cubiq.org/license */
export default (function ( window, document, Math ) {
    var rAF = window.requestAnimationFrame ||
        window.webkitRequestAnimationFrame ||
        window.mozRequestAnimationFrame ||
        window.oRequestAnimationFrame ||
        window.msRequestAnimationFrame ||
        function ( callback ) {
            window.setTimeout( callback, 1000 / 60 );
        };

    var utils = (function () {
        var me = {};

        var _elementStyle = document.createElement( 'div' ).style;
        var _vendor = (function () {
            var vendors = [ 't', 'webkitT', 'MozT', 'msT', 'OT' ],
                transform,
                i = 0,
                l = vendors.length;

            for ( ; i < l; i++ ) {
                transform = vendors[ i ] + 'ransform';
                if ( transform in _elementStyle ) return vendors[ i ].substr( 0, vendors[ i ].length - 1 );
            }

            return false;
        })();

        function _prefixStyle( style ) {
            if ( _vendor === false ) return false;
            if ( _vendor === '' ) return style;
            return _vendor + style.charAt( 0 ).toUpperCase() + style.substr( 1 );
        }

        me.getTime = Date.now || function getTime() {
            return new Date().getTime();
        };

        me.extend = function ( target, obj ) {
            for ( var i in obj ) {
                target[ i ] = obj[ i ];
            }
        };

        me.addEvent = function ( el, type, fn, capture ) {
            el.addEventListener( type, fn, !!capture );
        };

        me.removeEvent = function ( el, type, fn, capture ) {
            el.removeEventListener( type, fn, !!capture );
        };

        me.prefixPointerEvent = function ( pointerEvent ) {
            return window.MSPointerEvent ?
                'MSPointer' + pointerEvent.charAt( 7 ).toUpperCase() + pointerEvent.substr( 8 ) :
                pointerEvent;
        };

        me.momentum = function ( current, start, time, lowerMargin, wrapperSize, deceleration ) {
            var distance = current - start,
                speed = Math.abs( distance ) / time,
                destination,
                duration;

            deceleration = deceleration === undefined ? 0.0006 : deceleration;

            destination = current + ( speed * speed ) / ( 2 * deceleration ) * ( distance < 0 ? -1 : 1 );
            duration = speed / deceleration;

            if ( destination < lowerMargin ) {
                destination = wrapperSize ? lowerMargin - ( wrapperSize / 2.5 * ( speed / 8 ) ) : lowerMargin;
                distance = Math.abs( destination - current );
                duration = distance / speed;
            } else if ( destination > 0 ) {
                destination = wrapperSize ? wrapperSize / 2.5 * ( speed / 8 ) : 0;
                distance = Math.abs( current ) + destination;
                duration = distance / speed;
            }

            return {
                destination: Math.round( destination ),
                duration: duration
            };
        };

        var _transform = _prefixStyle( 'transform' );

        me.extend( me, {
            hasTransform: _transform !== false,
            hasPerspective: _prefixStyle( 'perspective' ) in _elementStyle,
            hasTouch: 'ontouchstart' in window,
            hasPointer: !!(window.PointerEvent || window.MSPointerEvent), // IE10 is prefixed
            hasTransition: _prefixStyle( 'transition' ) in _elementStyle
        } );

        /*
	This should find all Android browsers lower than build 535.19 (both stock browser and webview)
	- galaxy S2 is ok
    - 2.3.6 : `AppleWebKit/533.1 (KHTML, like Gecko) Version/4.0 Mobile Safari/533.1`
    - 4.0.4 : `AppleWebKit/534.30 (KHTML, like Gecko) Version/4.0 Mobile Safari/534.30`
   - galaxy S3 is badAndroid (stock brower, webview)
     `AppleWebKit/534.30 (KHTML, like Gecko) Version/4.0 Mobile Safari/534.30`
   - galaxy S4 is badAndroid (stock brower, webview)
     `AppleWebKit/534.30 (KHTML, like Gecko) Version/4.0 Mobile Safari/534.30`
   - galaxy S5 is OK
     `AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Mobile Safari/537.36 (Chrome/)`
   - galaxy S6 is OK
     `AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Mobile Safari/537.36 (Chrome/)`
  */
        me.isBadAndroid = (function () {
            var appVersion = window.navigator.appVersion;
            // Android browser is not a chrome browser.
            if ( /Android/.test( appVersion ) && !(/Chrome\/\d/.test( appVersion )) ) {
                var safariVersion = appVersion.match( /Safari\/(\d+.\d)/ );
                if ( safariVersion && typeof safariVersion === "object" && safariVersion.length >= 2 ) {
                    return parseFloat( safariVersion[ 1 ] ) < 535.19;
                } else {
                    return true;
                }
            } else {
                return false;
            }
        })();

        me.extend( me.style = {}, {
            transform: _transform,
            transitionTimingFunction: _prefixStyle( 'transitionTimingFunction' ),
            transitionDuration: _prefixStyle( 'transitionDuration' ),
            transitionDelay: _prefixStyle( 'transitionDelay' ),
            transformOrigin: _prefixStyle( 'transformOrigin' ),
            touchAction: _prefixStyle( 'touchAction' )
        } );

        me.hasClass = function ( e, c ) {
            var re = new RegExp( "(^|\\s)" + c + "(\\s|$)" );
            return re.test( e.className );
        };

        me.addClass = function ( e, c ) {
            if ( me.hasClass( e, c ) ) {
                return;
            }

            var newclass = e.className.split( ' ' );
            newclass.push( c );
            e.className = newclass.join( ' ' );
        };

        me.removeClass = function ( e, c ) {
            if ( !me.hasClass( e, c ) ) {
                return;
            }

            var re = new RegExp( "(^|\\s)" + c + "(\\s|$)", 'g' );
            e.className = e.className.replace( re, ' ' );
        };

        me.offset = function ( el ) {
            var left = -el.offsetLeft,
                top = -el.offsetTop;

            // jshint -W084
            while ( el = el.offsetParent ) {
                left -= el.offsetLeft;
                top -= el.offsetTop;
            }
            // jshint +W084

            return {
                left: left,
                top: top
            };
        };

        me.preventDefaultException = function ( el, exceptions ) {
            for ( var i in exceptions ) {
                if ( exceptions[ i ].test( el[ i ] ) ) {
                    return true;
                }
            }

            return false;
        };

        me.extend( me.eventType = {}, {
            touchstart: 1,
            touchmove: 1,
            touchend: 1,

            mousedown: 2,
            mousemove: 2,
            mouseup: 2,

            pointerdown: 3,
            pointermove: 3,
            pointerup: 3,

            MSPointerDown: 3,
            MSPointerMove: 3,
            MSPointerUp: 3
        } );

        me.extend( me.ease = {}, {
            quadratic: {
                style: 'cubic-bezier(0.25, 0.46, 0.45, 0.94)',
                fn: function ( k ) {
                    return k * ( 2 - k );
                }
            },
            circular: {
                style: 'cubic-bezier(0.1, 0.57, 0.1, 1)',	// Not properly "circular" but this looks better, it should be (0.075, 0.82, 0.165, 1)
                fn: function ( k ) {
                    return Math.sqrt( 1 - ( --k * k ) );
                }
            },
            back: {
                style: 'cubic-bezier(0.175, 0.885, 0.32, 1.275)',
                fn: function ( k ) {
                    var b = 4;
                    return ( k = k - 1 ) * k * ( ( b + 1 ) * k + b ) + 1;
                }
            },
            bounce: {
                style: '',
                fn: function ( k ) {
                    if ( ( k /= 1 ) < ( 1 / 2.75 ) ) {
                        return 7.5625 * k * k;
                    } else if ( k < ( 2 / 2.75 ) ) {
                        return 7.5625 * ( k -= ( 1.5 / 2.75 ) ) * k + 0.75;
                    } else if ( k < ( 2.5 / 2.75 ) ) {
                        return 7.5625 * ( k -= ( 2.25 / 2.75 ) ) * k + 0.9375;
                    } else {
                        return 7.5625 * ( k -= ( 2.625 / 2.75 ) ) * k + 0.984375;
                    }
                }
            },
            elastic: {
                style: '',
                fn: function ( k ) {
                    var f = 0.22,
                        e = 0.4;

                    if ( k === 0 ) {
                        return 0;
                    }
                    if ( k == 1 ) {
                        return 1;
                    }

                    return ( e * Math.pow( 2, -10 * k ) * Math.sin( ( k - f / 4 ) * ( 2 * Math.PI ) / f ) + 1 );
                }
            }
        } );

        me.tap = function ( e, eventName ) {
            var ev = document.createEvent( 'Event' );
            ev.initEvent( eventName, true, true );
            ev.pageX = e.pageX;
            ev.pageY = e.pageY;
            e.target.dispatchEvent( ev );
        };

        me.click = function ( e ) {
            var target = e.target,
                ev;

            if ( !(/(SELECT|INPUT|TEXTAREA)/i).test( target.tagName ) ) {
                // https://developer.mozilla.org/en-US/docs/Web/API/MouseEvent/initMouseEvent
                // initMouseEvent is deprecated.
                ev = document.createEvent( window.MouseEvent ? 'MouseEvents' : 'Event' );
                ev.initEvent( 'click', true, true );
                ev.view = e.view || window;
                ev.detail = 1;
                ev.screenX = target.screenX || 0;
                ev.screenY = target.screenY || 0;
                ev.clientX = target.clientX || 0;
                ev.clientY = target.clientY || 0;
                ev.ctrlKey = !!e.ctrlKey;
                ev.altKey = !!e.altKey;
                ev.shiftKey = !!e.shiftKey;
                ev.metaKey = !!e.metaKey;
                ev.button = 0;
                ev.relatedTarget = null;
                ev._constructed = true;
                target.dispatchEvent( ev );
            }
        };

        me.getTouchAction = function ( eventPassthrough, addPinch ) {
            var touchAction = 'none';
            if ( eventPassthrough === 'vertical' ) {
                touchAction = 'pan-y';
            } else if ( eventPassthrough === 'horizontal' ) {
                touchAction = 'pan-x';
            }
            if ( addPinch && touchAction != 'none' ) {
                // add pinch-zoom support if the browser supports it, but if not (eg. Chrome <55) do nothing
                touchAction += ' pinch-zoom';
            }
            return touchAction;
        };

        me.getRect = function ( el ) {
            if ( el instanceof SVGElement ) {
                var rect = el.getBoundingClientRect();
                return {
                    top: rect.top,
                    left: rect.left,
                    width: rect.width,
                    height: rect.height
                };
            } else {
                return {
                    top: el.offsetTop,
                    left: el.offsetLeft,
                    width: el.offsetWidth,
                    height: el.offsetHeight
                };
            }
        };

        return me;
    })();

    function IScroll( el, options ) {
        this.wrapper = typeof el == 'string' ? document.querySelector( el ) : el;
        this.scroller = this.wrapper.children[ 0 ];
        this.scrollerStyle = this.scroller.style;		// cache style for better performance

        this.options = {

            zoomMin: 1,
            zoomMax: 4, startZoom: 1,

            resizeScrollbars: true,

            mouseWheelSpeed: 20,

            snapThreshold: 0.334,

// INSERT POINT: OPTIONS
            disablePointer: !utils.hasPointer,
            disableTouch: utils.hasPointer || !utils.hasTouch,
            disableMouse: utils.hasPointer || utils.hasTouch,
            startX: 0,
            startY: 0,
            scrollY: true,
            directionLockThreshold: 5,
            momentum: true,

            bounce: true,
            bounceTime: 600,
            bounceEasing: '',

            preventDefault: true,
            preventDefaultException: { tagName: /^(INPUT|TEXTAREA|BUTTON|SELECT)$/ },

            HWCompositing: true,
            useTransition: true,
            useTransform: true,
            bindToWrapper: typeof window.onmousedown === "undefined"
        };

        for ( var i in options ) {
            this.options[ i ] = options[ i ];
        }

        // Normalize options
        this.translateZ = this.options.HWCompositing && utils.hasPerspective ? ' translateZ(0)' : '';

        this.options.useTransition = utils.hasTransition && this.options.useTransition;
        this.options.useTransform = utils.hasTransform && this.options.useTransform;

        this.options.eventPassthrough = this.options.eventPassthrough === true ? 'vertical' : this.options.eventPassthrough;
        this.options.preventDefault = !this.options.eventPassthrough && this.options.preventDefault;

        // If you want eventPassthrough I have to lock one of the axes
        this.options.scrollY = this.options.eventPassthrough == 'vertical' ? false : this.options.scrollY;
        this.options.scrollX = this.options.eventPassthrough == 'horizontal' ? false : this.options.scrollX;

        // With eventPassthrough we also need lockDirection mechanism
        this.options.freeScroll = this.options.freeScroll && !this.options.eventPassthrough;
        this.options.directionLockThreshold = this.options.eventPassthrough ? 0 : this.options.directionLockThreshold;

        this.options.bounceEasing = typeof this.options.bounceEasing == 'string' ? utils.ease[ this.options.bounceEasing ] || utils.ease.circular : this.options.bounceEasing;

        this.options.resizePolling = this.options.resizePolling === undefined ? 60 : this.options.resizePolling;

        if ( this.options.tap === true ) {
            this.options.tap = 'tap';
        }

        // https://github.com/cubiq/iscroll/issues/1029
        if ( !this.options.useTransition && !this.options.useTransform ) {
            if ( !(/relative|absolute/i).test( this.scrollerStyle.position ) ) {
                this.scrollerStyle.position = "relative";
            }
        }

        if ( this.options.shrinkScrollbars == 'scale' ) {
            this.options.useTransition = false;
        }

        this.options.invertWheelDirection = this.options.invertWheelDirection ? -1 : 1;

// INSERT POINT: NORMALIZATION

        // Some defaults
        this.x = 0;
        this.y = 0;
        this.directionX = 0;
        this.directionY = 0;
        this._events = {};

        this.scale = Math.min( Math.max( this.options.startZoom, this.options.zoomMin ), this.options.zoomMax );

// INSERT POINT: DEFAULTS

        this._init();
        this.refresh();

        this.scrollTo( this.options.startX, this.options.startY );
        this.enable();
    }

    IScroll.prototype = {
        version: '5.2.0-snapshot',

        _init: function () {
            this._initEvents();

            if ( this.options.zoom ) {
                this._initZoom();
            }

            if ( this.options.scrollbars || this.options.indicators ) {
                this._initIndicators();
            }

            if ( this.options.mouseWheel ) {
                this._initWheel();
            }

            if ( this.options.snap ) {
                this._initSnap();
            }

            if ( this.options.keyBindings ) {
                this._initKeys();
            }

// INSERT POINT: _init

        },

        destroy: function () {
            this._initEvents( true );
            clearTimeout( this.resizeTimeout );
            this.resizeTimeout = null;
            this._execEvent( 'destroy' );
        },

        _transitionEnd: function ( e ) {
            if ( e.target != this.scroller || !this.isInTransition ) {
                return;
            }

            this._transitionTime();
            if ( !this.resetPosition( this.options.bounceTime ) ) {
                this.isInTransition = false;
                this._execEvent( 'scrollEnd' );
            }
        },

        _start: function ( e ) {
            // React to left mouse button only
            if ( utils.eventType[ e.type ] != 1 ) {
                // for button property
                // http://unixpapa.com/js/mouse.html
                var button;
                if ( !e.which ) {
                    /* IE case */
                    button = (e.button < 2) ? 0 :
                        ((e.button == 4) ? 1 : 2);
                } else {
                    /* All others */
                    button = e.button;
                }
                if ( button !== 0 ) {
                    return;
                }
            }

            if ( !this.enabled || (this.initiated && utils.eventType[ e.type ] !== this.initiated) ) {
                return;
            }

            if ( this.options.preventDefault && !utils.isBadAndroid && !utils.preventDefaultException( e.target, this.options.preventDefaultException ) ) {
                e.preventDefault();
            }

            var point = e.touches ? e.touches[ 0 ] : e,
                pos;

            this.initiated = utils.eventType[ e.type ];
            this.moved = false;
            this.distX = 0;
            this.distY = 0;
            this.directionX = 0;
            this.directionY = 0;
            this.directionLocked = 0;

            this.startTime = utils.getTime();

            if ( this.options.useTransition && this.isInTransition ) {
                this._transitionTime();
                this.isInTransition = false;
                pos = this.getComputedPosition();
                this._translate( Math.round( pos.x ), Math.round( pos.y ) );
                this._execEvent( 'scrollEnd' );
            } else if ( !this.options.useTransition && this.isAnimating ) {
                this.isAnimating = false;
                this._execEvent( 'scrollEnd' );
            }

            this.startX = this.x;
            this.startY = this.y;
            this.absStartX = this.x;
            this.absStartY = this.y;
            this.pointX = point.pageX;
            this.pointY = point.pageY;

            this._execEvent( 'beforeScrollStart' );
        },

        _move: function ( e ) {
            if ( !this.enabled || utils.eventType[ e.type ] !== this.initiated ) {
                return;
            }

            if ( this.options.preventDefault ) {	// increases performance on Android? TODO: check!
                e.preventDefault();
            }

            var point = e.touches ? e.touches[ 0 ] : e,
                deltaX = point.pageX - this.pointX,
                deltaY = point.pageY - this.pointY,
                timestamp = utils.getTime(),
                newX, newY,
                absDistX, absDistY;

            this.pointX = point.pageX;
            this.pointY = point.pageY;

            this.distX += deltaX;
            this.distY += deltaY;
            absDistX = Math.abs( this.distX );
            absDistY = Math.abs( this.distY );

            // We need to move at least 10 pixels for the scrolling to initiate
            if ( timestamp - this.endTime > 300 && (absDistX < 10 && absDistY < 10) ) {
                return;
            }

            // If you are scrolling in one direction lock the other
            if ( !this.directionLocked && !this.options.freeScroll ) {
                if ( absDistX > absDistY + this.options.directionLockThreshold ) {
                    this.directionLocked = 'h';		// lock horizontally
                } else if ( absDistY >= absDistX + this.options.directionLockThreshold ) {
                    this.directionLocked = 'v';		// lock vertically
                } else {
                    this.directionLocked = 'n';		// no lock
                }
            }

            if ( this.directionLocked == 'h' ) {
                if ( this.options.eventPassthrough == 'vertical' ) {
                    e.preventDefault();
                } else if ( this.options.eventPassthrough == 'horizontal' ) {
                    this.initiated = false;
                    return;
                }

                deltaY = 0;
            } else if ( this.directionLocked == 'v' ) {
                if ( this.options.eventPassthrough == 'horizontal' ) {
                    e.preventDefault();
                } else if ( this.options.eventPassthrough == 'vertical' ) {
                    this.initiated = false;
                    return;
                }

                deltaX = 0;
            }

            deltaX = this.hasHorizontalScroll ? deltaX : 0;
            deltaY = this.hasVerticalScroll ? deltaY : 0;

            newX = this.x + deltaX;
            newY = this.y + deltaY;

            // Slow down if outside of the boundaries
            if ( newX > 0 || newX < this.maxScrollX ) {
                newX = this.options.bounce ? this.x + deltaX / 3 : newX > 0 ? 0 : this.maxScrollX;
            }
            if ( newY > 0 || newY < this.maxScrollY ) {
                newY = this.options.bounce ? this.y + deltaY / 3 : newY > 0 ? 0 : this.maxScrollY;
            }

            this.directionX = deltaX > 0 ? -1 : deltaX < 0 ? 1 : 0;
            this.directionY = deltaY > 0 ? -1 : deltaY < 0 ? 1 : 0;

            if ( !this.moved ) {
                this._execEvent( 'scrollStart' );
            }

            this.moved = true;

            this._translate( newX, newY );

            /* REPLACE START: _move */

            if ( timestamp - this.startTime > 300 ) {
                this.startTime = timestamp;
                this.startX = this.x;
                this.startY = this.y;
            }

            /* REPLACE END: _move */

        },

        _end: function ( e ) {
            if ( !this.enabled || utils.eventType[ e.type ] !== this.initiated ) {
                return;
            }

            if ( this.options.preventDefault && !utils.preventDefaultException( e.target, this.options.preventDefaultException ) ) {
                e.preventDefault();
            }

            var point = e.changedTouches ? e.changedTouches[ 0 ] : e,
                momentumX,
                momentumY,
                duration = utils.getTime() - this.startTime,
                newX = Math.round( this.x ),
                newY = Math.round( this.y ),
                distanceX = Math.abs( newX - this.startX ),
                distanceY = Math.abs( newY - this.startY ),
                time = 0,
                easing = '';

            this.isInTransition = 0;
            this.initiated = 0;
            this.endTime = utils.getTime();

            // reset if we are outside of the boundaries
            if ( this.resetPosition( this.options.bounceTime ) ) {
                return;
            }

            this.scrollTo( newX, newY );	// ensures that the last position is rounded

            // we scrolled less than 10 pixels
            if ( !this.moved ) {
                if ( this.options.tap ) {
                    utils.tap( e, this.options.tap );
                }

                if ( this.options.click ) {
                    utils.click( e );
                }

                this._execEvent( 'scrollCancel' );
                return;
            }

            if ( this._events.flick && duration < 200 && distanceX < 100 && distanceY < 100 ) {
                this._execEvent( 'flick' );
                return;
            }

            // start momentum animation if needed
            if ( this.options.momentum && duration < 300 ) {
                momentumX = this.hasHorizontalScroll ? utils.momentum( this.x, this.startX, duration, this.maxScrollX, this.options.bounce ? this.wrapperWidth : 0, this.options.deceleration ) : {
                    destination: newX,
                    duration: 0
                };
                momentumY = this.hasVerticalScroll ? utils.momentum( this.y, this.startY, duration, this.maxScrollY, this.options.bounce ? this.wrapperHeight : 0, this.options.deceleration ) : {
                    destination: newY,
                    duration: 0
                };
                newX = momentumX.destination;
                newY = momentumY.destination;
                time = Math.max( momentumX.duration, momentumY.duration );
                this.isInTransition = 1;
            }


            if ( this.options.snap ) {
                var snap = this._nearestSnap( newX, newY );
                this.currentPage = snap;
                time = this.options.snapSpeed || Math.max(
                    Math.max(
                        Math.min( Math.abs( newX - snap.x ), 1000 ),
                        Math.min( Math.abs( newY - snap.y ), 1000 )
                    ), 300 );
                newX = snap.x;
                newY = snap.y;

                this.directionX = 0;
                this.directionY = 0;
                easing = this.options.bounceEasing;
            }

// INSERT POINT: _end

            if ( newX != this.x || newY != this.y ) {
                // change easing function when scroller goes out of the boundaries
                if ( newX > 0 || newX < this.maxScrollX || newY > 0 || newY < this.maxScrollY ) {
                    easing = utils.ease.quadratic;
                }

                this.scrollTo( newX, newY, time, easing );
                return;
            }

            this._execEvent( 'scrollEnd' );
        },

        _resize: function () {
            var that = this;

            clearTimeout( this.resizeTimeout );

            this.resizeTimeout = setTimeout( function () {
                that.refresh();
            }, this.options.resizePolling );
        },

        resetPosition: function ( time ) {
            var x = this.x,
                y = this.y;

            time = time || 0;

            if ( !this.hasHorizontalScroll || this.x > 0 ) {
                x = 0;
            } else if ( this.x < this.maxScrollX ) {
                x = this.maxScrollX;
            }

            if ( !this.hasVerticalScroll || this.y > 0 ) {
                y = 0;
            } else if ( this.y < this.maxScrollY ) {
                y = this.maxScrollY;
            }

            if ( x == this.x && y == this.y ) {
                return false;
            }

            this.scrollTo( x, y, time, this.options.bounceEasing );

            return true;
        },

        disable: function () {
            this.enabled = false;
        },

        enable: function () {
            this.enabled = true;
        },

        refresh: function () {
            utils.getRect( this.wrapper );		// Force reflow

            this.wrapperWidth = this.wrapper.clientWidth;
            this.wrapperHeight = this.wrapper.clientHeight;

            var rect = utils.getRect( this.scroller );
            /* REPLACE START: refresh */
            this.scrollerWidth = Math.round( rect.width * this.scale );
            this.scrollerHeight = Math.round( rect.height * this.scale );

            this.maxScrollX = this.wrapperWidth - this.scrollerWidth;
            this.maxScrollY = this.wrapperHeight - this.scrollerHeight;
            /* REPLACE END: refresh */

            this.hasHorizontalScroll = this.options.scrollX && this.maxScrollX < 0;
            this.hasVerticalScroll = this.options.scrollY && this.maxScrollY < 0;

            if ( !this.hasHorizontalScroll ) {
                this.maxScrollX = 0;
                this.scrollerWidth = this.wrapperWidth;
            }

            if ( !this.hasVerticalScroll ) {
                this.maxScrollY = 0;
                this.scrollerHeight = this.wrapperHeight;
            }

            this.endTime = 0;
            this.directionX = 0;
            this.directionY = 0;

            if ( utils.hasPointer && !this.options.disablePointer ) {
                // The wrapper should have `touchAction` property for using pointerEvent.
                this.wrapper.style[ utils.style.touchAction ] = utils.getTouchAction( this.options.eventPassthrough, true );

                // case. not support 'pinch-zoom'
                // https://github.com/cubiq/iscroll/issues/1118#issuecomment-270057583
                if ( !this.wrapper.style[ utils.style.touchAction ] ) {
                    this.wrapper.style[ utils.style.touchAction ] = utils.getTouchAction( this.options.eventPassthrough, false );
                }
            }
            this.wrapperOffset = utils.offset( this.wrapper );

            this._execEvent( 'refresh' );

            this.resetPosition();

// INSERT POINT: _refresh

        },

        on: function ( type, fn ) {
            if ( !this._events[ type ] ) {
                this._events[ type ] = [];
            }

            this._events[ type ].push( fn );
        },

        off: function ( type, fn ) {
            if ( !this._events[ type ] ) {
                return;
            }

            var index = this._events[ type ].indexOf( fn );

            if ( index > -1 ) {
                this._events[ type ].splice( index, 1 );
            }
        },

        _execEvent: function ( type ) {
            if ( !this._events[ type ] ) {
                return;
            }

            var i = 0,
                l = this._events[ type ].length;

            if ( !l ) {
                return;
            }

            for ( ; i < l; i++ ) {
                this._events[ type ][ i ].apply( this, [].slice.call( arguments, 1 ) );
            }
        },

        scrollBy: function ( x, y, time, easing ) {
            x = this.x + x;
            y = this.y + y;
            time = time || 0;

            this.scrollTo( x, y, time, easing );
        },

        scrollTo: function ( x, y, time, easing ) {
            easing = easing || utils.ease.circular;

            this.isInTransition = this.options.useTransition && time > 0;
            var transitionType = this.options.useTransition && easing.style;
            if ( !time || transitionType ) {
                if ( transitionType ) {
                    this._transitionTimingFunction( easing.style );
                    this._transitionTime( time );
                }
                this._translate( x, y );
            } else {
                this._animate( x, y, time, easing.fn );
            }
        },

        scrollToElement: function ( el, time, offsetX, offsetY, easing ) {
            el = el.nodeType ? el : this.scroller.querySelector( el );

            if ( !el ) {
                return;
            }

            var pos = utils.offset( el );

            pos.left -= this.wrapperOffset.left;
            pos.top -= this.wrapperOffset.top;

            // if offsetX/Y are true we center the element to the screen
            var elRect = utils.getRect( el );
            var wrapperRect = utils.getRect( this.wrapper );
            if ( offsetX === true ) {
                offsetX = Math.round( elRect.width / 2 - wrapperRect.width / 2 );
            }
            if ( offsetY === true ) {
                offsetY = Math.round( elRect.height / 2 - wrapperRect.height / 2 );
            }

            pos.left -= offsetX || 0;
            pos.top -= offsetY || 0;

            pos.left = pos.left > 0 ? 0 : pos.left < this.maxScrollX ? this.maxScrollX : pos.left;
            pos.top = pos.top > 0 ? 0 : pos.top < this.maxScrollY ? this.maxScrollY : pos.top;

            time = time === undefined || time === null || time === 'auto' ? Math.max( Math.abs( this.x - pos.left ), Math.abs( this.y - pos.top ) ) : time;

            this.scrollTo( pos.left, pos.top, time, easing );
        },

        _transitionTime: function ( time ) {
            if ( !this.options.useTransition ) {
                return;
            }
            time = time || 0;
            var durationProp = utils.style.transitionDuration;
            if ( !durationProp ) {
                return;
            }

            this.scrollerStyle[ durationProp ] = time + 'ms';

            if ( !time && utils.isBadAndroid ) {
                this.scrollerStyle[ durationProp ] = '0.0001ms';
                // remove 0.0001ms
                var self = this;
                rAF( function () {
                    if ( self.scrollerStyle[ durationProp ] === '0.0001ms' ) {
                        self.scrollerStyle[ durationProp ] = '0s';
                    }
                } );
            }


            if ( this.indicators ) {
                for ( var i = this.indicators.length; i--; ) {
                    this.indicators[ i ].transitionTime( time );
                }
            }


// INSERT POINT: _transitionTime

        },

        _transitionTimingFunction: function ( easing ) {
            this.scrollerStyle[ utils.style.transitionTimingFunction ] = easing;


            if ( this.indicators ) {
                for ( var i = this.indicators.length; i--; ) {
                    this.indicators[ i ].transitionTimingFunction( easing );
                }
            }


// INSERT POINT: _transitionTimingFunction

        },

        _translate: function ( x, y ) {
            if ( this.options.useTransform ) {

                /* REPLACE START: _translate */
                this.scrollerStyle[ utils.style.transform ] = 'translate(' + x + 'px,' + y + 'px) scale(' + this.scale + ') ' + this.translateZ;
                /* REPLACE END: _translate */

            } else {
                x = Math.round( x );
                y = Math.round( y );
                this.scrollerStyle.left = x + 'px';
                this.scrollerStyle.top = y + 'px';
            }

            this.x = x;
            this.y = y;


            if ( this.indicators ) {
                for ( var i = this.indicators.length; i--; ) {
                    this.indicators[ i ].updatePosition();
                }
            }


// INSERT POINT: _translate

        },

        _initEvents: function ( remove ) {
            var eventType = remove ? utils.removeEvent : utils.addEvent,
                target = this.options.bindToWrapper ? this.wrapper : window;

            eventType( window, 'orientationchange', this );
            eventType( window, 'resize', this );

            if ( this.options.click ) {
                eventType( this.wrapper, 'click', this, true );
            }

            if ( !this.options.disableMouse ) {
                eventType( this.wrapper, 'mousedown', this );
                eventType( target, 'mousemove', this );
                eventType( target, 'mousecancel', this );
                eventType( target, 'mouseup', this );
            }

            if ( utils.hasPointer && !this.options.disablePointer ) {
                eventType( this.wrapper, utils.prefixPointerEvent( 'pointerdown' ), this );
                eventType( target, utils.prefixPointerEvent( 'pointermove' ), this );
                eventType( target, utils.prefixPointerEvent( 'pointercancel' ), this );
                eventType( target, utils.prefixPointerEvent( 'pointerup' ), this );
            }

            if ( utils.hasTouch && !this.options.disableTouch ) {
                eventType( this.wrapper, 'touchstart', this );
                eventType( target, 'touchmove', this );
                eventType( target, 'touchcancel', this );
                eventType( target, 'touchend', this );
            }

            eventType( this.scroller, 'transitionend', this );
            eventType( this.scroller, 'webkitTransitionEnd', this );
            eventType( this.scroller, 'oTransitionEnd', this );
            eventType( this.scroller, 'MSTransitionEnd', this );
        },

        getComputedPosition: function () {
            var matrix = window.getComputedStyle( this.scroller, null ),
                x, y;

            if ( this.options.useTransform ) {
                matrix = matrix[ utils.style.transform ].split( ')' )[ 0 ].split( ', ' );
                x = +(matrix[ 12 ] || matrix[ 4 ]);
                y = +(matrix[ 13 ] || matrix[ 5 ]);
            } else {
                x = +matrix.left.replace( /[^-\d.]/g, '' );
                y = +matrix.top.replace( /[^-\d.]/g, '' );
            }

            return { x: x, y: y };
        },
        _initIndicators: function () {
            var interactive = this.options.interactiveScrollbars,
                customStyle = typeof this.options.scrollbars != 'string',
                indicators = [],
                indicator;

            var that = this;

            this.indicators = [];

            if ( this.options.scrollbars ) {
                // Vertical scrollbar
                if ( this.options.scrollY ) {
                    indicator = {
                        el: createDefaultScrollbar( 'v', interactive, this.options.scrollbars ),
                        interactive: interactive,
                        defaultScrollbars: true,
                        customStyle: customStyle,
                        resize: this.options.resizeScrollbars,
                        shrink: this.options.shrinkScrollbars,
                        fade: this.options.fadeScrollbars,
                        listenX: false
                    };

                    this.wrapper.appendChild( indicator.el );
                    indicators.push( indicator );
                }

                // Horizontal scrollbar
                if ( this.options.scrollX ) {
                    indicator = {
                        el: createDefaultScrollbar( 'h', interactive, this.options.scrollbars ),
                        interactive: interactive,
                        defaultScrollbars: true,
                        customStyle: customStyle,
                        resize: this.options.resizeScrollbars,
                        shrink: this.options.shrinkScrollbars,
                        fade: this.options.fadeScrollbars,
                        listenY: false
                    };

                    this.wrapper.appendChild( indicator.el );
                    indicators.push( indicator );
                }
            }

            if ( this.options.indicators ) {
                // TODO: check concat compatibility
                indicators = indicators.concat( this.options.indicators );
            }

            for ( var i = indicators.length; i--; ) {
                this.indicators.push( new Indicator( this, indicators[ i ] ) );
            }

            // TODO: check if we can use array.map (wide compatibility and performance issues)
            function _indicatorsMap( fn ) {
                if ( that.indicators ) {
                    for ( var i = that.indicators.length; i--; ) {
                        fn.call( that.indicators[ i ] );
                    }
                }
            }

            if ( this.options.fadeScrollbars ) {
                this.on( 'scrollEnd', function () {
                    _indicatorsMap( function () {
                        this.fade();
                    } );
                } );

                this.on( 'scrollCancel', function () {
                    _indicatorsMap( function () {
                        this.fade();
                    } );
                } );

                this.on( 'scrollStart', function () {
                    _indicatorsMap( function () {
                        this.fade( 1 );
                    } );
                } );

                this.on( 'beforeScrollStart', function () {
                    _indicatorsMap( function () {
                        this.fade( 1, true );
                    } );
                } );
            }


            this.on( 'refresh', function () {
                _indicatorsMap( function () {
                    this.refresh();
                } );
            } );

            this.on( 'destroy', function () {
                _indicatorsMap( function () {
                    this.destroy();
                } );

                delete this.indicators;
            } );
        },

        _initZoom: function () {
            this.scrollerStyle[ utils.style.transformOrigin ] = '0 0';
        },

        _zoomStart: function ( e ) {
            var c1 = Math.abs( e.touches[ 0 ].pageX - e.touches[ 1 ].pageX ),
                c2 = Math.abs( e.touches[ 0 ].pageY - e.touches[ 1 ].pageY );

            this.touchesDistanceStart = Math.sqrt( c1 * c1 + c2 * c2 );
            this.startScale = this.scale;

            this.originX = Math.abs( e.touches[ 0 ].pageX + e.touches[ 1 ].pageX ) / 2 + this.wrapperOffset.left - this.x;
            this.originY = Math.abs( e.touches[ 0 ].pageY + e.touches[ 1 ].pageY ) / 2 + this.wrapperOffset.top - this.y;

            this._execEvent( 'zoomStart' );
        },

        _zoom: function ( e ) {
            if ( !this.enabled || utils.eventType[ e.type ] !== this.initiated ) {
                return;
            }

            if ( this.options.preventDefault ) {
                e.preventDefault();
            }

            var c1 = Math.abs( e.touches[ 0 ].pageX - e.touches[ 1 ].pageX ),
                c2 = Math.abs( e.touches[ 0 ].pageY - e.touches[ 1 ].pageY ),
                distance = Math.sqrt( c1 * c1 + c2 * c2 ),
                scale = 1 / this.touchesDistanceStart * distance * this.startScale,
                lastScale,
                x, y;

            this.scaled = true;

            if ( scale < this.options.zoomMin ) {
                scale = 0.5 * this.options.zoomMin * Math.pow( 2.0, scale / this.options.zoomMin );
            } else if ( scale > this.options.zoomMax ) {
                scale = 2.0 * this.options.zoomMax * Math.pow( 0.5, this.options.zoomMax / scale );
            }

            lastScale = scale / this.startScale;
            x = this.originX - this.originX * lastScale + this.startX;
            y = this.originY - this.originY * lastScale + this.startY;

            this.scale = scale;

            this.scrollTo( x, y, 0 );
        },

        _zoomEnd: function ( e ) {
            if ( !this.enabled || utils.eventType[ e.type ] !== this.initiated ) {
                return;
            }

            if ( this.options.preventDefault ) {
                e.preventDefault();
            }

            var newX, newY,
                lastScale;

            this.isInTransition = 0;
            this.initiated = 0;

            if ( this.scale > this.options.zoomMax ) {
                this.scale = this.options.zoomMax;
            } else if ( this.scale < this.options.zoomMin ) {
                this.scale = this.options.zoomMin;
            }

            // Update boundaries
            this.refresh();

            lastScale = this.scale / this.startScale;

            newX = this.originX - this.originX * lastScale + this.startX;
            newY = this.originY - this.originY * lastScale + this.startY;

            if ( newX > 0 ) {
                newX = 0;
            } else if ( newX < this.maxScrollX ) {
                newX = this.maxScrollX;
            }

            if ( newY > 0 ) {
                newY = 0;
            } else if ( newY < this.maxScrollY ) {
                newY = this.maxScrollY;
            }

            if ( this.x != newX || this.y != newY ) {
                this.scrollTo( newX, newY, this.options.bounceTime );
            }

            this.scaled = false;

            this._execEvent( 'zoomEnd' );
        },

        zoom: function ( scale, x, y, time ) {
            if ( scale < this.options.zoomMin ) {
                scale = this.options.zoomMin;
            } else if ( scale > this.options.zoomMax ) {
                scale = this.options.zoomMax;
            }

            if ( scale == this.scale ) {
                return;
            }

            var relScale = scale / this.scale;

            x = x === undefined ? this.wrapperWidth / 2 : x;
            y = y === undefined ? this.wrapperHeight / 2 : y;
            time = time === undefined ? 300 : time;

            x = x + this.wrapperOffset.left - this.x;
            y = y + this.wrapperOffset.top - this.y;

            x = x - x * relScale + this.x;
            y = y - y * relScale + this.y;

            this.scale = scale;

            this.refresh();		// update boundaries

            if ( x > 0 ) {
                x = 0;
            } else if ( x < this.maxScrollX ) {
                x = this.maxScrollX;
            }

            if ( y > 0 ) {
                y = 0;
            } else if ( y < this.maxScrollY ) {
                y = this.maxScrollY;
            }

            this.scrollTo( x, y, time );
        },

        _wheelZoom: function ( e ) {
            var wheelDeltaY,
                deltaScale,
                that = this;

            // Execute the zoomEnd event after 400ms the wheel stopped scrolling
            clearTimeout( this.wheelTimeout );
            this.wheelTimeout = setTimeout( function () {
                that._execEvent( 'zoomEnd' );
            }, 400 );

            if ( 'deltaX' in e ) {
                wheelDeltaY = -e.deltaY / Math.abs( e.deltaY );
            } else if ( 'wheelDeltaX' in e ) {
                wheelDeltaY = e.wheelDeltaY / Math.abs( e.wheelDeltaY );
            } else if ( 'wheelDelta' in e ) {
                wheelDeltaY = e.wheelDelta / Math.abs( e.wheelDelta );
            } else if ( 'detail' in e ) {
                wheelDeltaY = -e.detail / Math.abs( e.wheelDelta );
            } else {
                return;
            }

            deltaScale = this.scale + wheelDeltaY / 5;

            this.zoom( deltaScale, e.pageX, e.pageY, 0 );
        },

        _initWheel: function () {
            utils.addEvent( this.wrapper, 'wheel', this );
            utils.addEvent( this.wrapper, 'mousewheel', this );
            utils.addEvent( this.wrapper, 'DOMMouseScroll', this );

            this.on( 'destroy', function () {
                clearTimeout( this.wheelTimeout );
                this.wheelTimeout = null;
                utils.removeEvent( this.wrapper, 'wheel', this );
                utils.removeEvent( this.wrapper, 'mousewheel', this );
                utils.removeEvent( this.wrapper, 'DOMMouseScroll', this );
            } );
        },

        _wheel: function ( e ) {
            if ( !this.enabled ) {
                return;
            }

            e.preventDefault();

            var wheelDeltaX, wheelDeltaY,
                newX, newY,
                that = this;

            if ( this.wheelTimeout === undefined ) {
                that._execEvent( 'scrollStart' );
            }

            // Execute the scrollEnd event after 400ms the wheel stopped scrolling
            clearTimeout( this.wheelTimeout );
            this.wheelTimeout = setTimeout( function () {
                if ( !that.options.snap ) {
                    that._execEvent( 'scrollEnd' );
                }
                that.wheelTimeout = undefined;
            }, 400 );

            if ( 'deltaX' in e ) {
                if ( e.deltaMode === 1 ) {
                    wheelDeltaX = -e.deltaX * this.options.mouseWheelSpeed;
                    wheelDeltaY = -e.deltaY * this.options.mouseWheelSpeed;
                } else {
                    wheelDeltaX = -e.deltaX;
                    wheelDeltaY = -e.deltaY;
                }
            } else if ( 'wheelDeltaX' in e ) {
                wheelDeltaX = e.wheelDeltaX / 120 * this.options.mouseWheelSpeed;
                wheelDeltaY = e.wheelDeltaY / 120 * this.options.mouseWheelSpeed;
            } else if ( 'wheelDelta' in e ) {
                wheelDeltaX = wheelDeltaY = e.wheelDelta / 120 * this.options.mouseWheelSpeed;
            } else if ( 'detail' in e ) {
                wheelDeltaX = wheelDeltaY = -e.detail / 3 * this.options.mouseWheelSpeed;
            } else {
                return;
            }

            wheelDeltaX *= this.options.invertWheelDirection;
            wheelDeltaY *= this.options.invertWheelDirection;

            if ( !this.hasVerticalScroll ) {
                wheelDeltaX = wheelDeltaY;
                wheelDeltaY = 0;
            }

            if ( this.options.snap ) {
                newX = this.currentPage.pageX;
                newY = this.currentPage.pageY;

                if ( wheelDeltaX > 0 ) {
                    newX--;
                } else if ( wheelDeltaX < 0 ) {
                    newX++;
                }

                if ( wheelDeltaY > 0 ) {
                    newY--;
                } else if ( wheelDeltaY < 0 ) {
                    newY++;
                }

                this.goToPage( newX, newY );

                return;
            }

            newX = this.x + Math.round( this.hasHorizontalScroll ? wheelDeltaX : 0 );
            newY = this.y + Math.round( this.hasVerticalScroll ? wheelDeltaY : 0 );

            this.directionX = wheelDeltaX > 0 ? -1 : wheelDeltaX < 0 ? 1 : 0;
            this.directionY = wheelDeltaY > 0 ? -1 : wheelDeltaY < 0 ? 1 : 0;

            if ( newX > 0 ) {
                newX = 0;
            } else if ( newX < this.maxScrollX ) {
                newX = this.maxScrollX;
            }

            if ( newY > 0 ) {
                newY = 0;
            } else if ( newY < this.maxScrollY ) {
                newY = this.maxScrollY;
            }

            this.scrollTo( newX, newY, 0 );

// INSERT POINT: _wheel
        },

        _initSnap: function () {
            this.currentPage = {};

            if ( typeof this.options.snap == 'string' ) {
                this.options.snap = this.scroller.querySelectorAll( this.options.snap );
            }

            this.on( 'refresh', function () {
                var i = 0, l,
                    m = 0, n,
                    cx, cy,
                    x = 0, y,
                    stepX = this.options.snapStepX || this.wrapperWidth,
                    stepY = this.options.snapStepY || this.wrapperHeight,
                    el,
                    rect;

                this.pages = [];

                if ( !this.wrapperWidth || !this.wrapperHeight || !this.scrollerWidth || !this.scrollerHeight ) {
                    return;
                }

                if ( this.options.snap === true ) {
                    cx = Math.round( stepX / 2 );
                    cy = Math.round( stepY / 2 );

                    while ( x > -this.scrollerWidth ) {
                        this.pages[ i ] = [];
                        l = 0;
                        y = 0;

                        while ( y > -this.scrollerHeight ) {
                            this.pages[ i ][ l ] = {
                                x: Math.max( x, this.maxScrollX ),
                                y: Math.max( y, this.maxScrollY ),
                                width: stepX,
                                height: stepY,
                                cx: x - cx,
                                cy: y - cy
                            };

                            y -= stepY;
                            l++;
                        }

                        x -= stepX;
                        i++;
                    }
                } else {
                    el = this.options.snap;
                    l = el.length;
                    n = -1;

                    for ( ; i < l; i++ ) {
                        rect = utils.getRect( el[ i ] );
                        if ( i === 0 || rect.left <= utils.getRect( el[ i - 1 ] ).left ) {
                            m = 0;
                            n++;
                        }

                        if ( !this.pages[ m ] ) {
                            this.pages[ m ] = [];
                        }

                        x = Math.max( -rect.left, this.maxScrollX );
                        y = Math.max( -rect.top, this.maxScrollY );
                        cx = x - Math.round( rect.width / 2 );
                        cy = y - Math.round( rect.height / 2 );

                        this.pages[ m ][ n ] = {
                            x: x,
                            y: y,
                            width: rect.width,
                            height: rect.height,
                            cx: cx,
                            cy: cy
                        };

                        if ( x > this.maxScrollX ) {
                            m++;
                        }
                    }
                }

                this.goToPage( this.currentPage.pageX || 0, this.currentPage.pageY || 0, 0 );

                // Update snap threshold if needed
                if ( this.options.snapThreshold % 1 === 0 ) {
                    this.snapThresholdX = this.options.snapThreshold;
                    this.snapThresholdY = this.options.snapThreshold;
                } else {
                    this.snapThresholdX = Math.round( this.pages[ this.currentPage.pageX ][ this.currentPage.pageY ].width * this.options.snapThreshold );
                    this.snapThresholdY = Math.round( this.pages[ this.currentPage.pageX ][ this.currentPage.pageY ].height * this.options.snapThreshold );
                }
            } );

            this.on( 'flick', function () {
                var time = this.options.snapSpeed || Math.max(
                    Math.max(
                        Math.min( Math.abs( this.x - this.startX ), 1000 ),
                        Math.min( Math.abs( this.y - this.startY ), 1000 )
                    ), 300 );

                this.goToPage(
                    this.currentPage.pageX + this.directionX,
                    this.currentPage.pageY + this.directionY,
                    time
                );
            } );
        },

        _nearestSnap: function ( x, y ) {
            if ( !this.pages.length ) {
                return { x: 0, y: 0, pageX: 0, pageY: 0 };
            }

            var i = 0,
                l = this.pages.length,
                m = 0;

            // Check if we exceeded the snap threshold
            if ( Math.abs( x - this.absStartX ) < this.snapThresholdX &&
                Math.abs( y - this.absStartY ) < this.snapThresholdY ) {
                return this.currentPage;
            }

            if ( x > 0 ) {
                x = 0;
            } else if ( x < this.maxScrollX ) {
                x = this.maxScrollX;
            }

            if ( y > 0 ) {
                y = 0;
            } else if ( y < this.maxScrollY ) {
                y = this.maxScrollY;
            }

            for ( ; i < l; i++ ) {
                if ( x >= this.pages[ i ][ 0 ].cx ) {
                    x = this.pages[ i ][ 0 ].x;
                    break;
                }
            }

            l = this.pages[ i ].length;

            for ( ; m < l; m++ ) {
                if ( y >= this.pages[ 0 ][ m ].cy ) {
                    y = this.pages[ 0 ][ m ].y;
                    break;
                }
            }

            if ( i == this.currentPage.pageX ) {
                i += this.directionX;

                if ( i < 0 ) {
                    i = 0;
                } else if ( i >= this.pages.length ) {
                    i = this.pages.length - 1;
                }

                x = this.pages[ i ][ 0 ].x;
            }

            if ( m == this.currentPage.pageY ) {
                m += this.directionY;

                if ( m < 0 ) {
                    m = 0;
                } else if ( m >= this.pages[ 0 ].length ) {
                    m = this.pages[ 0 ].length - 1;
                }

                y = this.pages[ 0 ][ m ].y;
            }

            return {
                x: x,
                y: y,
                pageX: i,
                pageY: m
            };
        },

        goToPage: function ( x, y, time, easing ) {
            easing = easing || this.options.bounceEasing;

            if ( x >= this.pages.length ) {
                x = this.pages.length - 1;
            } else if ( x < 0 ) {
                x = 0;
            }

            if ( y >= this.pages[ x ].length ) {
                y = this.pages[ x ].length - 1;
            } else if ( y < 0 ) {
                y = 0;
            }

            var posX = this.pages[ x ][ y ].x,
                posY = this.pages[ x ][ y ].y;

            time = time === undefined ? this.options.snapSpeed || Math.max(
                Math.max(
                    Math.min( Math.abs( posX - this.x ), 1000 ),
                    Math.min( Math.abs( posY - this.y ), 1000 )
                ), 300 ) : time;

            this.currentPage = {
                x: posX,
                y: posY,
                pageX: x,
                pageY: y
            };

            this.scrollTo( posX, posY, time, easing );
        },

        next: function ( time, easing ) {
            var x = this.currentPage.pageX,
                y = this.currentPage.pageY;

            x++;

            if ( x >= this.pages.length && this.hasVerticalScroll ) {
                x = 0;
                y++;
            }

            this.goToPage( x, y, time, easing );
        },

        prev: function ( time, easing ) {
            var x = this.currentPage.pageX,
                y = this.currentPage.pageY;

            x--;

            if ( x < 0 && this.hasVerticalScroll ) {
                x = 0;
                y--;
            }

            this.goToPage( x, y, time, easing );
        },

        _initKeys: function ( e ) {
            // default key bindings
            var keys = {
                pageUp: 33,
                pageDown: 34,
                end: 35,
                home: 36,
                left: 37,
                up: 38,
                right: 39,
                down: 40
            };
            var i;

            // if you give me characters I give you keycode
            if ( typeof this.options.keyBindings == 'object' ) {
                for ( i in this.options.keyBindings ) {
                    if ( typeof this.options.keyBindings[ i ] == 'string' ) {
                        this.options.keyBindings[ i ] = this.options.keyBindings[ i ].toUpperCase().charCodeAt( 0 );
                    }
                }
            } else {
                this.options.keyBindings = {};
            }

            for ( i in keys ) {
                this.options.keyBindings[ i ] = this.options.keyBindings[ i ] || keys[ i ];
            }

            utils.addEvent( window, 'keydown', this );

            this.on( 'destroy', function () {
                utils.removeEvent( window, 'keydown', this );
            } );
        },

        _key: function ( e ) {
            if ( !this.enabled ) {
                return;
            }

            var snap = this.options.snap,	// we are using this alot, better to cache it
                newX = snap ? this.currentPage.pageX : this.x,
                newY = snap ? this.currentPage.pageY : this.y,
                now = utils.getTime(),
                prevTime = this.keyTime || 0,
                acceleration = 0.250,
                pos;

            if ( this.options.useTransition && this.isInTransition ) {
                pos = this.getComputedPosition();

                this._translate( Math.round( pos.x ), Math.round( pos.y ) );
                this.isInTransition = false;
            }

            this.keyAcceleration = now - prevTime < 200 ? Math.min( this.keyAcceleration + acceleration, 50 ) : 0;

            switch ( e.keyCode ) {
                case this.options.keyBindings.pageUp:
                    if ( this.hasHorizontalScroll && !this.hasVerticalScroll ) {
                        newX += snap ? 1 : this.wrapperWidth;
                    } else {
                        newY += snap ? 1 : this.wrapperHeight;
                    }
                    break;
                case this.options.keyBindings.pageDown:
                    if ( this.hasHorizontalScroll && !this.hasVerticalScroll ) {
                        newX -= snap ? 1 : this.wrapperWidth;
                    } else {
                        newY -= snap ? 1 : this.wrapperHeight;
                    }
                    break;
                case this.options.keyBindings.end:
                    newX = snap ? this.pages.length - 1 : this.maxScrollX;
                    newY = snap ? this.pages[ 0 ].length - 1 : this.maxScrollY;
                    break;
                case this.options.keyBindings.home:
                    newX = 0;
                    newY = 0;
                    break;
                case this.options.keyBindings.left:
                    newX += snap ? -1 : 5 + this.keyAcceleration >> 0;
                    break;
                case this.options.keyBindings.up:
                    newY += snap ? 1 : 5 + this.keyAcceleration >> 0;
                    break;
                case this.options.keyBindings.right:
                    newX -= snap ? -1 : 5 + this.keyAcceleration >> 0;
                    break;
                case this.options.keyBindings.down:
                    newY -= snap ? 1 : 5 + this.keyAcceleration >> 0;
                    break;
                default:
                    return;
            }

            if ( snap ) {
                this.goToPage( newX, newY );
                return;
            }

            if ( newX > 0 ) {
                newX = 0;
                this.keyAcceleration = 0;
            } else if ( newX < this.maxScrollX ) {
                newX = this.maxScrollX;
                this.keyAcceleration = 0;
            }

            if ( newY > 0 ) {
                newY = 0;
                this.keyAcceleration = 0;
            } else if ( newY < this.maxScrollY ) {
                newY = this.maxScrollY;
                this.keyAcceleration = 0;
            }

            this.scrollTo( newX, newY, 0 );

            this.keyTime = now;
        },

        _animate: function ( destX, destY, duration, easingFn ) {
            var that = this,
                startX = this.x,
                startY = this.y,
                startTime = utils.getTime(),
                destTime = startTime + duration;

            function step() {
                var now = utils.getTime(),
                    newX, newY,
                    easing;

                if ( now >= destTime ) {
                    that.isAnimating = false;
                    that._translate( destX, destY );

                    if ( !that.resetPosition( that.options.bounceTime ) ) {
                        that._execEvent( 'scrollEnd' );
                    }

                    return;
                }

                now = ( now - startTime ) / duration;
                easing = easingFn( now );
                newX = ( destX - startX ) * easing + startX;
                newY = ( destY - startY ) * easing + startY;
                that._translate( newX, newY );

                if ( that.isAnimating ) {
                    rAF( step );
                }
            }

            this.isAnimating = true;
            step();
        },
        handleEvent: function ( e ) {
            switch ( e.type ) {
                case 'touchstart':
                case 'pointerdown':
                case 'MSPointerDown':
                case 'mousedown':
                    this._start( e );

                    if ( this.options.zoom && e.touches && e.touches.length > 1 ) {
                        this._zoomStart( e );
                    }
                    break;
                case 'touchmove':
                case 'pointermove':
                case 'MSPointerMove':
                case 'mousemove':
                    if ( this.options.zoom && e.touches && e.touches[ 1 ] ) {
                        this._zoom( e );
                        return;
                    }
                    this._move( e );
                    break;
                case 'touchend':
                case 'pointerup':
                case 'MSPointerUp':
                case 'mouseup':
                case 'touchcancel':
                case 'pointercancel':
                case 'MSPointerCancel':
                case 'mousecancel':
                    if ( this.scaled ) {
                        this._zoomEnd( e );
                        return;
                    }
                    this._end( e );
                    break;
                case 'orientationchange':
                case 'resize':
                    this._resize();
                    break;
                case 'transitionend':
                case 'webkitTransitionEnd':
                case 'oTransitionEnd':
                case 'MSTransitionEnd':
                    this._transitionEnd( e );
                    break;
                case 'wheel':
                case 'DOMMouseScroll':
                case 'mousewheel':
                    if ( this.options.wheelAction == 'zoom' ) {
                        this._wheelZoom( e );
                        return;
                    }
                    this._wheel( e );
                    break;
                case 'keydown':
                    this._key( e );
                    break;
            }
        }

    };

    function createDefaultScrollbar( direction, interactive, type ) {
        var scrollbar = document.createElement( 'div' ),
            indicator = document.createElement( 'div' );

        if ( type === true ) {
            scrollbar.style.cssText = 'position:absolute;z-index:9999';
            indicator.style.cssText = '-webkit-box-sizing:border-box;-moz-box-sizing:border-box;box-sizing:border-box;position:absolute;background:rgba(0,0,0,0.5);border:1px solid rgba(255,255,255,0.9);border-radius:3px';
        }

        indicator.className = 'iScrollIndicator';

        if ( direction == 'h' ) {
            if ( type === true ) {
                scrollbar.style.cssText += ';height:7px;left:2px;right:2px;bottom:0';
                indicator.style.height = '100%';
            }
            scrollbar.className = 'iScrollHorizontalScrollbar';
        } else {
            if ( type === true ) {
                scrollbar.style.cssText += ';width:7px;bottom:2px;top:2px;right:1px';
                indicator.style.width = '100%';
            }
            scrollbar.className = 'iScrollVerticalScrollbar';
        }

        scrollbar.style.cssText += ';overflow:hidden';

        if ( !interactive ) {
            scrollbar.style.pointerEvents = 'none';
        }

        scrollbar.appendChild( indicator );

        return scrollbar;
    }

    function Indicator( scroller, options ) {
        this.wrapper = typeof options.el == 'string' ? document.querySelector( options.el ) : options.el;
        this.wrapperStyle = this.wrapper.style;
        this.indicator = this.wrapper.children[ 0 ];
        this.indicatorStyle = this.indicator.style;
        this.scroller = scroller;

        this.options = {
            listenX: true,
            listenY: true,
            interactive: false,
            resize: true,
            defaultScrollbars: false,
            shrink: false,
            fade: false,
            speedRatioX: 0,
            speedRatioY: 0
        };

        for ( var i in options ) {
            this.options[ i ] = options[ i ];
        }

        this.sizeRatioX = 1;
        this.sizeRatioY = 1;
        this.maxPosX = 0;
        this.maxPosY = 0;

        if ( this.options.interactive ) {
            if ( !this.options.disableTouch ) {
                utils.addEvent( this.indicator, 'touchstart', this );
                utils.addEvent( window, 'touchend', this );
            }
            if ( !this.options.disablePointer ) {
                utils.addEvent( this.indicator, utils.prefixPointerEvent( 'pointerdown' ), this );
                utils.addEvent( window, utils.prefixPointerEvent( 'pointerup' ), this );
            }
            if ( !this.options.disableMouse ) {
                utils.addEvent( this.indicator, 'mousedown', this );
                utils.addEvent( window, 'mouseup', this );
            }
        }

        if ( this.options.fade ) {
            this.wrapperStyle[ utils.style.transform ] = this.scroller.translateZ;
            var durationProp = utils.style.transitionDuration;
            if ( !durationProp ) {
                return;
            }
            this.wrapperStyle[ durationProp ] = utils.isBadAndroid ? '0.0001ms' : '0ms';
            // remove 0.0001ms
            var self = this;
            if ( utils.isBadAndroid ) {
                rAF( function () {
                    if ( self.wrapperStyle[ durationProp ] === '0.0001ms' ) {
                        self.wrapperStyle[ durationProp ] = '0s';
                    }
                } );
            }
            this.wrapperStyle.opacity = '0';
        }
    }

    Indicator.prototype = {
        handleEvent: function ( e ) {
            switch ( e.type ) {
                case 'touchstart':
                case 'pointerdown':
                case 'MSPointerDown':
                case 'mousedown':
                    this._start( e );
                    break;
                case 'touchmove':
                case 'pointermove':
                case 'MSPointerMove':
                case 'mousemove':
                    this._move( e );
                    break;
                case 'touchend':
                case 'pointerup':
                case 'MSPointerUp':
                case 'mouseup':
                case 'touchcancel':
                case 'pointercancel':
                case 'MSPointerCancel':
                case 'mousecancel':
                    this._end( e );
                    break;
            }
        },

        destroy: function () {
            if ( this.options.fadeScrollbars ) {
                clearTimeout( this.fadeTimeout );
                this.fadeTimeout = null;
            }
            if ( this.options.interactive ) {
                utils.removeEvent( this.indicator, 'touchstart', this );
                utils.removeEvent( this.indicator, utils.prefixPointerEvent( 'pointerdown' ), this );
                utils.removeEvent( this.indicator, 'mousedown', this );

                utils.removeEvent( window, 'touchmove', this );
                utils.removeEvent( window, utils.prefixPointerEvent( 'pointermove' ), this );
                utils.removeEvent( window, 'mousemove', this );

                utils.removeEvent( window, 'touchend', this );
                utils.removeEvent( window, utils.prefixPointerEvent( 'pointerup' ), this );
                utils.removeEvent( window, 'mouseup', this );
            }

            if ( this.options.defaultScrollbars && this.wrapper.parentNode ) {
                this.wrapper.parentNode.removeChild( this.wrapper );
            }
        },

        _start: function ( e ) {
            var point = e.touches ? e.touches[ 0 ] : e;

            e.preventDefault();
            e.stopPropagation();

            this.transitionTime();

            this.initiated = true;
            this.moved = false;
            this.lastPointX = point.pageX;
            this.lastPointY = point.pageY;

            this.startTime = utils.getTime();

            if ( !this.options.disableTouch ) {
                utils.addEvent( window, 'touchmove', this );
            }
            if ( !this.options.disablePointer ) {
                utils.addEvent( window, utils.prefixPointerEvent( 'pointermove' ), this );
            }
            if ( !this.options.disableMouse ) {
                utils.addEvent( window, 'mousemove', this );
            }

            this.scroller._execEvent( 'beforeScrollStart' );
        },

        _move: function ( e ) {
            var point = e.touches ? e.touches[ 0 ] : e,
                deltaX, deltaY,
                newX, newY,
                timestamp = utils.getTime();

            if ( !this.moved ) {
                this.scroller._execEvent( 'scrollStart' );
            }

            this.moved = true;

            deltaX = point.pageX - this.lastPointX;
            this.lastPointX = point.pageX;

            deltaY = point.pageY - this.lastPointY;
            this.lastPointY = point.pageY;

            newX = this.x + deltaX;
            newY = this.y + deltaY;

            this._pos( newX, newY );

// INSERT POINT: indicator._move

            e.preventDefault();
            e.stopPropagation();
        },

        _end: function ( e ) {
            if ( !this.initiated ) {
                return;
            }

            this.initiated = false;

            e.preventDefault();
            e.stopPropagation();

            utils.removeEvent( window, 'touchmove', this );
            utils.removeEvent( window, utils.prefixPointerEvent( 'pointermove' ), this );
            utils.removeEvent( window, 'mousemove', this );

            if ( this.scroller.options.snap ) {
                var snap = this.scroller._nearestSnap( this.scroller.x, this.scroller.y );

                var time = this.options.snapSpeed || Math.max(
                    Math.max(
                        Math.min( Math.abs( this.scroller.x - snap.x ), 1000 ),
                        Math.min( Math.abs( this.scroller.y - snap.y ), 1000 )
                    ), 300 );

                if ( this.scroller.x != snap.x || this.scroller.y != snap.y ) {
                    this.scroller.directionX = 0;
                    this.scroller.directionY = 0;
                    this.scroller.currentPage = snap;
                    this.scroller.scrollTo( snap.x, snap.y, time, this.scroller.options.bounceEasing );
                }
            }

            if ( this.moved ) {
                this.scroller._execEvent( 'scrollEnd' );
            }
        },

        transitionTime: function ( time ) {
            time = time || 0;
            var durationProp = utils.style.transitionDuration;
            if ( !durationProp ) {
                return;
            }

            this.indicatorStyle[ durationProp ] = time + 'ms';

            if ( !time && utils.isBadAndroid ) {
                this.indicatorStyle[ durationProp ] = '0.0001ms';
                // remove 0.0001ms
                var self = this;
                rAF( function () {
                    if ( self.indicatorStyle[ durationProp ] === '0.0001ms' ) {
                        self.indicatorStyle[ durationProp ] = '0s';
                    }
                } );
            }
        },

        transitionTimingFunction: function ( easing ) {
            this.indicatorStyle[ utils.style.transitionTimingFunction ] = easing;
        },

        refresh: function () {
            this.transitionTime();

            if ( this.options.listenX && !this.options.listenY ) {
                this.indicatorStyle.display = this.scroller.hasHorizontalScroll ? 'block' : 'none';
            } else if ( this.options.listenY && !this.options.listenX ) {
                this.indicatorStyle.display = this.scroller.hasVerticalScroll ? 'block' : 'none';
            } else {
                this.indicatorStyle.display = this.scroller.hasHorizontalScroll || this.scroller.hasVerticalScroll ? 'block' : 'none';
            }

            if ( this.scroller.hasHorizontalScroll && this.scroller.hasVerticalScroll ) {
                utils.addClass( this.wrapper, 'iScrollBothScrollbars' );
                utils.removeClass( this.wrapper, 'iScrollLoneScrollbar' );

                if ( this.options.defaultScrollbars && this.options.customStyle ) {
                    if ( this.options.listenX ) {
                        this.wrapper.style.right = '8px';
                    } else {
                        this.wrapper.style.bottom = '8px';
                    }
                }
            } else {
                utils.removeClass( this.wrapper, 'iScrollBothScrollbars' );
                utils.addClass( this.wrapper, 'iScrollLoneScrollbar' );

                if ( this.options.defaultScrollbars && this.options.customStyle ) {
                    if ( this.options.listenX ) {
                        this.wrapper.style.right = '2px';
                    } else {
                        this.wrapper.style.bottom = '2px';
                    }
                }
            }

            utils.getRect( this.wrapper );	// force refresh

            if ( this.options.listenX ) {
                this.wrapperWidth = this.wrapper.clientWidth;
                if ( this.options.resize ) {
                    this.indicatorWidth = Math.max( Math.round( this.wrapperWidth * this.wrapperWidth / (this.scroller.scrollerWidth || this.wrapperWidth || 1) ), 8 );
                    this.indicatorStyle.width = this.indicatorWidth + 'px';
                } else {
                    this.indicatorWidth = this.indicator.clientWidth;
                }

                this.maxPosX = this.wrapperWidth - this.indicatorWidth;

                if ( this.options.shrink == 'clip' ) {
                    this.minBoundaryX = -this.indicatorWidth + 8;
                    this.maxBoundaryX = this.wrapperWidth - 8;
                } else {
                    this.minBoundaryX = 0;
                    this.maxBoundaryX = this.maxPosX;
                }

                this.sizeRatioX = this.options.speedRatioX || (this.scroller.maxScrollX && (this.maxPosX / this.scroller.maxScrollX));
            }

            if ( this.options.listenY ) {
                this.wrapperHeight = this.wrapper.clientHeight;
                if ( this.options.resize ) {
                    this.indicatorHeight = Math.max( Math.round( this.wrapperHeight * this.wrapperHeight / (this.scroller.scrollerHeight || this.wrapperHeight || 1) ), 8 );
                    this.indicatorStyle.height = this.indicatorHeight + 'px';
                } else {
                    this.indicatorHeight = this.indicator.clientHeight;
                }

                this.maxPosY = this.wrapperHeight - this.indicatorHeight;

                if ( this.options.shrink == 'clip' ) {
                    this.minBoundaryY = -this.indicatorHeight + 8;
                    this.maxBoundaryY = this.wrapperHeight - 8;
                } else {
                    this.minBoundaryY = 0;
                    this.maxBoundaryY = this.maxPosY;
                }

                this.maxPosY = this.wrapperHeight - this.indicatorHeight;
                this.sizeRatioY = this.options.speedRatioY || (this.scroller.maxScrollY && (this.maxPosY / this.scroller.maxScrollY));
            }

            this.updatePosition();
        },

        updatePosition: function () {
            var x = this.options.listenX && Math.round( this.sizeRatioX * this.scroller.x ) || 0,
                y = this.options.listenY && Math.round( this.sizeRatioY * this.scroller.y ) || 0;

            if ( !this.options.ignoreBoundaries ) {
                if ( x < this.minBoundaryX ) {
                    if ( this.options.shrink == 'scale' ) {
                        this.width = Math.max( this.indicatorWidth + x, 8 );
                        this.indicatorStyle.width = this.width + 'px';
                    }
                    x = this.minBoundaryX;
                } else if ( x > this.maxBoundaryX ) {
                    if ( this.options.shrink == 'scale' ) {
                        this.width = Math.max( this.indicatorWidth - (x - this.maxPosX), 8 );
                        this.indicatorStyle.width = this.width + 'px';
                        x = this.maxPosX + this.indicatorWidth - this.width;
                    } else {
                        x = this.maxBoundaryX;
                    }
                } else if ( this.options.shrink == 'scale' && this.width != this.indicatorWidth ) {
                    this.width = this.indicatorWidth;
                    this.indicatorStyle.width = this.width + 'px';
                }

                if ( y < this.minBoundaryY ) {
                    if ( this.options.shrink == 'scale' ) {
                        this.height = Math.max( this.indicatorHeight + y * 3, 8 );
                        this.indicatorStyle.height = this.height + 'px';
                    }
                    y = this.minBoundaryY;
                } else if ( y > this.maxBoundaryY ) {
                    if ( this.options.shrink == 'scale' ) {
                        this.height = Math.max( this.indicatorHeight - (y - this.maxPosY) * 3, 8 );
                        this.indicatorStyle.height = this.height + 'px';
                        y = this.maxPosY + this.indicatorHeight - this.height;
                    } else {
                        y = this.maxBoundaryY;
                    }
                } else if ( this.options.shrink == 'scale' && this.height != this.indicatorHeight ) {
                    this.height = this.indicatorHeight;
                    this.indicatorStyle.height = this.height + 'px';
                }
            }

            this.x = x;
            this.y = y;

            if ( this.scroller.options.useTransform ) {
                this.indicatorStyle[ utils.style.transform ] = 'translate(' + x + 'px,' + y + 'px)' + this.scroller.translateZ;
            } else {
                this.indicatorStyle.left = x + 'px';
                this.indicatorStyle.top = y + 'px';
            }
        },

        _pos: function ( x, y ) {
            if ( x < 0 ) {
                x = 0;
            } else if ( x > this.maxPosX ) {
                x = this.maxPosX;
            }

            if ( y < 0 ) {
                y = 0;
            } else if ( y > this.maxPosY ) {
                y = this.maxPosY;
            }

            x = this.options.listenX ? Math.round( x / this.sizeRatioX ) : this.scroller.x;
            y = this.options.listenY ? Math.round( y / this.sizeRatioY ) : this.scroller.y;

            this.scroller.scrollTo( x, y );
        },

        fade: function ( val, hold ) {
            if ( hold && !this.visible ) {
                return;
            }

            clearTimeout( this.fadeTimeout );
            this.fadeTimeout = null;

            var time = val ? 250 : 500,
                delay = val ? 0 : 300;

            val = val ? '1' : '0';

            this.wrapperStyle[ utils.style.transitionDuration ] = time + 'ms';

            this.fadeTimeout = setTimeout( (function ( val ) {
                this.wrapperStyle.opacity = val;
                this.visible = +val;
            }).bind( this, val ), delay );
        }
    };

    IScroll.utils = utils;

    return IScroll;

})( window, document, Math );
